Core-box



(No Model.) e

G. A. LAMBERT.

GORE BOX.

No. 517,387. Patented Mar. 27, 1894.

Suva whee UNInD STATES PATENT FFICET GEORGE A. LAMBERT, OF UNION CITY,OHIO.

CORE-BOX.

SPECIFICATION forming part of Letters Patent No. 517,387, dated March27, 1 894.

Application filed July '7, 1893. Serial No. 479,839. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. LAMBERT, a citizen of the United States,residing at Union City, in the county of Darke and State of Ohio, haveinvented certain new and useful Improvements in Apparatus for MakingOores, of which the following is a specification, reference being hadtherein to the accompanying drawings, in which Figure 1 is a perspectiveview of an ordinary tuft cutter or die; Fig. 2 a perspective view of thesand-core ready for use; Fig. 3 a perspective View of the core-box; Fig.4 a vertical section thereof, and Fig. 5 a vertical section of thecore-box and core therein.

This invention has-reference to the manufactu re of cores to be used incasting the wellknown steel tuft cutter or die shown in Fig. 1, whichconsists of an open tubular body formed cylindrical at its lower end,the interior of this cylindrical portion being longitudinally fluted orgrooved and its lower end being dressed off to a cutting edge having theconfiguration of the tufts to be cut.- In the making of these tools ithas been the custom for many years to first cast them, using plaintapering cores, which were formed in the usual manner in two part boxes,and then form the interior grooves (which are substantiallysemi-circular in cross-section) by drilling and the exterior of thecutting edge by dressing or grinding off the surplus metal in the usualmanner.' This method is costly and makes the market price of the toolunnecessarily high. It is rendered costly principally by thecomparatively laborious drilling operation required to form the interiorsemicircular flutes. And as a core that would form these grooves in thecasting of the tool could not be made on account of the flutes, by theusual method of making the cores, it was considered that the drillingwas an unavoidable necessity and that method has therefore beenpracticed for many years, notwithstanding the continued demand for acheaper tool of this character.

It is the object of this invention to simplify the method of making thistool and reduce its cost to a minimum, this being accomplished by doingaway with the drilling operation, this part of the process havingheretofore added fully four-fifths to the cost of the tool.

In carrying out this invention the core (as shown in Fig. 2) a,throughout its length is formed tapering toward its lower end, and onits lower end is formed a series of longitudinal beads a, whichterminate against an annular shoulder a" formed on the core a suitabledistance from its lower end. The core is formed in a core-box b which isa solid open-ended tube, having formed in its interior a series ofsemi-circular grooves b which extend from its lower end upward adistance equal to the length of thegrooves desired in the finished tool.From the upper ends of the grooves the interior of the core-box enlargesgradually upward to its upper end to facilitate the removal of the coreand impart to it the necessary taper. The fluted portion of the box ispreferably without taper. In making-the core, the sand is packed intothe core-box through its upper end until it is entirely filled; it isthen removed by forc ing it on dwise from the box by pressing againstits lower exposed end, the upward enlargement of the interior of the boxabove the flutes permitting the core to pass out readily and withoutinjury. One advantage in having the flutes extend entirely to the end ofthe core-box, whereby the entire surface of the core will be exposed,lies in the fact that a pushing tool having the configuration of thelower end of the core may be applied thereto in forcing it out of thebox, thereby avoiding injuring it. It will be observed that this corecould not be formed with the ordinary twopart core-box as the peculiarformation of the lower end of the core would prevent its withdrawal fromthe box without injuring its scalloped portion; it is this reason thathas compelled the designing of another method of forming the core- Itwill be seen that by this core-box the cores may be formed not onlyquickly and truly, but also with a uniform density, thus still furthercheapening the cost of manufacture of the tool. By means of this corethe tool can be cast with its interior fluted, the, flutes being as trueand smooth as those formed by drilling, thus avoiding the expensiveoperation of drilling the flutes in the tool after casting.

It is obvious that the only part of the corebox it is absolutelynecessary to form solid and open-ended is the fluted part; the uppertapering part of the box may therefore be formed in two parts ifdesired, although that construction is hardly deemed advisable.

Having thus fully described my invention, whatI claim is- 1. Acore-boxformed ofa tubehaving formed on its interior a series of flutes, saidfluted l portion extending from its lower end upward a suitable distanceand the interior of the box 10 from the fluted portion upward beingenlarged, substantially as described.

2. A core-box formed of an open-ended tube

